Correct Option
The correct option is 2 and 3 only.
Explanation
In physics, work is defined as the scalar product of force and displacement, and it depends on the component of force acting in the direction of displacement.
Statement-wise Analysis
- Statement 1: Incorrect. Work is a scalar quantity. It has magnitude only and no direction, as it is defined using the dot product of force and displacement.
- Statement 2: Correct. If the displacement of an object is zero, the work done by any force is zero because work depends directly on displacement.
- Statement 3: Correct. When an object moves horizontally, the force due to gravity acts vertically downward, making the angle between force and displacement 90°, resulting in zero work done.
Key Takeaway: Work is a scalar quantity and is done only when a force has a component along the direction of displacement.